Marine boiler



April 23, 1935. w. H ARMAcosT 1,998,828

MARINE BOILER Filed June 7, 1932 ATTORN EY Patented Apr 23, 1935 Q v, .r

NITED. sTATss- PATENT OFFlCE Wilbur H. Armacost, New York, N. Y., assignor toThe Superheater Company, New York, N; Y.

Application June 7, 1932, Serial No. 615,828

' w 2 Claims; (Glitz-235) p 3 Myinvention relates toboilers. Water cooled furnaces have added materially to the maximum output and averageefliciency of stationary boilers, but water walls are seldom em- 5 ployed in marine boilers on account of limited space and difiiculties of cleaning water walls as commonly arranged when applied to boilers designed for small volume.

One of the objects of my invention is to provide a boiler adapted for marine purposes which is efficient as well as convenient and economical to manufacture.

The novel features of my invention are pointed out in the appended claims. In order, however, 5 that the invention, together with its objects and advantages, may be more easily and fully understood, I will now describelin detail and in connection with the accompanying drawing, a marine boiler in accordance with my inventiomselected by way of example from a'number of possible embodiments thereof. In said drawing, v

The figure is a sectional elevation through a boiler in accordance with my invention taken on a vertical plane transverse to the steam and water drum and midway between the ends of said drum.

Referring to the drawing more in detail, In indicates the boiler as a whole. The boiler It] has a steam and water drum l2 which is preferably of large diameter compared with the total volume of the fire-box and tube bank so as to. provide ample surface for liberation of steam and to facilitate cleaning the tubes. Drum I 2 is set along one edge of the fire-box [4 which has an inclined bank of boiler tubes l6. Preferably, the lower row E8 of tubes in the bank 16 is of larger diameter than the remainder to enable them better to stand the intense radiant heat from the fire-box. The upper ends of the tubes in bank l6 are rolled into the drum l2 and the'lower ends of such tubes are rolled into a water drum or header 20 which is considerably smaller than the drum l2 and has an irregular or oval shape so that one side may be left open so as to be covered by removable plate 22.

The fire-box i4 is rectangular in horizontal plan and bounded on three sides by walls formed of rows of water tubes 24 and 25. The wall formed by the row of tubes 24 lies immediately below the drum i2 and tubes 24 connect into such drum at their upper ends. The walls formed by the tubes 25 lie at right angles to the drum l2 and tubes 25 connect at their upper ends to headers 28 only one of which is shown and which runs along one end of the drum l2. The wall of the fire-box opposite tubes 24 is much shorter than the wallformed by tubes 24 due to the inclination of the tube bank l6 and is formed by refractory covered water tubes 26. It will be understood that the fourth wall of the fire-box which is not illustrated, is identical with that shown as formed 5 bytubes 25 and the header 28. Tubes 24, 25 and 26 are connected at their lower ends into a mud ring or header 30.

The header 28 is connected to its counterpart, not illustrated, by a conduit 32 whichextends parallel to the drum l2 above the lower end of tube bank l6. Conduit 32 is connected to the drum l 2 by circulators 34 which incline somewhat upwardly so as to enter the drum l2 above its center and which serve also to support the roof 36.

Steam is taken off from drum l2 through outlet connectors 38 which leave drum 12 along its upper surface and incline downwardly at a sharper angle than the circulators 34 and therefore pass between circulators 34 which are spaced for this purpose. The lower ends of connectors 38 deliver into a steam header 4!; from which steam is discharged through the outlet pipe 42.

The tubes 26 are spaced at the central plane of the boiler to provide room for inserting a burner 44 which projects into the fire-box I4 beneath the lower end of tube bank I 5. A baflle 46 extends from the drum 20 along the upper edge of the tube bank l6 approximately one-half the length 730 of the tube bank, but the use or arrangement of such baffle is optional. An uptake 48 for the discharge of gases of combustion is shown near the conduit 32.

The operation of the boiler above described is as follows: The lower tubes in bank l6 act as risers and the upper tubes in such bank as downcomers, the tubes 26 furthermore, being protected by refractory, as shown, from the heat of the burner and the burner discharging away from such tubes, are able to act as downcomers to deliver water from drum into the ring 39 thereby supplying the tubes 24 and which act as risers. Tubes 24 of course deliver directly into the drum l2, whereas water and steam passing upwardly from ring through tubes 25 must pass along the headers 28 into conduit 32 and thence into drum l2 through circulators 34.

It will be seen that when the cover plate 22 is removed from one side of the drum 20 both the 50 upper ends of tubes 26 and the lower ends of tubes in bank Hi are available for cleaning and inspection. Furthermore, the steam outlets 38, by passing downwardly at a lower level than circulators 34,'serve to dry or superheat the steam.

The circulators 34 also are so arranged as to serve as convenient supports for the roof 36.

It is evident from the foregoing that a boiler in accordance with my invention has a large amount of radiant heating surface and therefore obtains a high output in proportion to its weight and that it nevertheless can be conveniently cleaned, all the tubes being substantially straight and their ends readily available for the insertion of the ordinary turbine-driven cleaners.

What I claim is:

1. A boiler having a steam and water drum, a generating tube bank inclined downwardly from said drum, a water drum into which the tubes of said bank are connected, water tubes arranged to surround a fire box for saidgenerating tubes on three sides and extending upwardly substantially to the level of said first drum and exposedto radiation in the fire box to serve as risers, refractory covered tubes having their upper ends'connected into said water drum, means connecting the lower ends of said refractory covered tubes with the lower ends of said radiant heated water wall tubes some of the radiant heated water wall tubes connecting directly into the steam and water drum at their upper ends, header means for radiant heated water wall tubes, lying in walls at right angles to said drum, a conduit parallel to said drum and connected to said header means, and circulators connecting said conduit to said drum.

2. A boiler having a fire-box outlined ,by water times, a steam and water drum, header means connecting to the upper ends of certain of said water tubes, a conduit parallel to said drum and connected to said header means, circulators connecting said conduit to said drum, a roof supported by said circulators, and steam outlet tubes connected :into the upper portion of said drum and passing between said circulators through the gas therebelow.

WILBUR H. ARMACOST. 

